URGENT.
1.what is a light pen and its functioning?
2.when a bar code reader used for input and how?
3.contrast the two memories
4.discuss the functioning of DVD
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Light pen
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display. It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.
bar code reader
Barcode readers are generally used by the shopping marts and big shops and library while selling things. the barcodes have special information stored in them and when we sense kt with our barcode scanner it reads the codes and get the information. this helps in maintaining the inventory.
memories
Primary Memory / Volatile Memory:
Primary Memory also called as volatile memory because the memory can’t store the data permanently. Primary memory select any part of memory when user want to save the data in memory but that may not be store permanently on that location. It also has another name i.e.
RAM.
Random Access Memory (RAM):
The primary storage is referred to as random access memory (RAM) due to the random selection of memory locations. It performs both read and write operations on memory. If power failures happened in systems during memory access then you will lose your data permanently. So, RAM is volatile memory.
DVD
DVD. Short for Digital Versatile Disc or Digital Video Disc, a DVD or DVD-ROM is a disc capable of storing large amounts of data on one disc the size of a standard Compact Disc.
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display. It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.
bar code reader
Barcode readers are generally used by the shopping marts and big shops and library while selling things. the barcodes have special information stored in them and when we sense kt with our barcode scanner it reads the codes and get the information. this helps in maintaining the inventory.
memories
Primary Memory / Volatile Memory:
Primary Memory also called as volatile memory because the memory can’t store the data permanently. Primary memory select any part of memory when user want to save the data in memory but that may not be store permanently on that location. It also has another name i.e.
RAM.
Random Access Memory (RAM):
The primary storage is referred to as random access memory (RAM) due to the random selection of memory locations. It performs both read and write operations on memory. If power failures happened in systems during memory access then you will lose your data permanently. So, RAM is volatile memory.
DVD
DVD. Short for Digital Versatile Disc or Digital Video Disc, a DVD or DVD-ROM is a disc capable of storing large amounts of data on one disc the size of a standard Compact Disc.
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